改变UINavigationBar导航条标题颜色和字体

   UINavigationController 可以 改变UINavigationBar导航条标题颜色和字体

    [self.navigationController.navigationBar setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:

    [UIColor colorWithRed:0 green:0.7 blue:0.8 alpha:1], UITextAttributeTextColor,

    [UIColor colorWithRed:0 green:0.7 blue:0.8 alpha:1], UITextAttributeTextShadowColor,

    [NSValue valueWithUIOffset:UIOffsetMake(0, 0)], UITextAttributeTextShadowOffset,

    [UIFont fontWithName:@"Arial-Bold" size:0.0], UITextAttributeFont,

    nil]];

    其中 UITextAttributeTextColor和UITextAttributeFont 属性是文字颜色和字体